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XRT7295IP

DS3/Sonet STS-1 Integrated Line Receiver

Exar Corporation 

...the analog plus companyTM

XR-T7295

DS3/Sonet STS-1

Integrated Line Receiver

FEATURES

D Fully Integrated Receive Interface for DS3 and

STS-1 Rate Signals

D Integrated Equalization (Optional) and Timing

Recovery

D Loss-of-Signal and Loss-of-Lock Alarms

D Variable Input Sensitivity Control

D 5V Power Supply

D Pin Compatible with XR-T7295E

D Companion Device to T7296 Transmitter

APPLICATIONS

D Interface to DS-3 Networks

D Digital Cross-Connect Systems

D CSU/DSU Equipment

D PCM Test Equipment

D Fiber Optic Terminals

June 1997-3

GENERAL DESCRIPTION

The XR-T7295 DS3/SONET STS-1 integrated line

receiver is a fully integrated receive interface that

terminates a bipolar DS3 (44.736Mbps) or Sonet STS-1

(51.84Mbps) signal transmitted over coaxial cable. (See

Figure 13).

The device also provides the functions of receive

equalization (optional), automatic-gain control (AGC),

clock-recovery and data retiming, loss-of-signal and

loss-of-frequency-lock detection. The digital system

interface is dual-rail, with received positive and negative

1s appearing as unipolar digital signals on separate

output leads. The on-chip equalizer is designed for cable

distances of 0 to 450ft. from the cross-connect frame to

the device. The receive input has a variable input

sensitivity control, providing three different sensitivity

settings, to adapt longer cables. High input sensitivity

allows for significant amounts of flat loss within the

system. Figure 1 shows the block diagram of the device.

The XR-T7295 device is manufactured using linear

CMOS technology. The XR-T7295 is available in either a

20-pin plastic DIP or 20-pin plastic SOJ package for

surface mounting.

Two versions of the chip are available, one is for either

DS3 or STS-1 operation (the XR-T7295, this data sheet),

and the other is for E3 operation (the XR-T7295E, refer to

the XR-T7295E data sheet). Both versions are pin

compatible.

For either DS3 or STS-1, an input reference clock at

44.736MHz or 51.84MHz provides the frequency

reference for the device.

ORDERING INFORMATION

Part No.

XR-T7295IP

XR-T7295IW

Package

20 Lead 300 Mil PDIP

20 Lead 300 Mil JEDEC SOJ

Operating

Temperature Range

-40°C to + 85°C

-40°C to + 85°C

Rev. 1.05

E1992

EXAR Corporation, 48720 Kato Road, Fremont, CA 94538 z (510) 668-7000 z FAX (510) 668-7017

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